DTC P1523 Throttle Closed Position Performance High Voltage Wow, thank you so much. DTC P1563 Cruise Vehicle Speed/Set Speed Difference Too High P1609 Loss Of TCS Serial Data P1610 Loss of PZM Serial Data P1611 Loss of CVRTD Serial Data P1612 Loss of IPM Serial Data P1613 Loss of DIM Serial Data P1614 Loss of RIM Serial Data P1615 Loss of VTD Serial Data P1617 Engine Oil Level Switch Circuit P1619 Engine Oil Life Monitor Reset Circuit P1656 Driver 2 Line 6P1657 1-4 Upshift Solenoid Control Circuit The accelerator assembly, control unit above it on a bracket, and the assemble that sits on top of the throttle body. P1536 Engine Coolant Overtemperature - Air Conditioning (A/C) onto the 3 Months Ago We Replaced The #2 Coil. But, I also noticed among the data anomalies a 12.0- to 13.0-volt reading on the ECM engine data stream, which conflicted with a 13.5-volt reading on the Body Control Module (BCM) data stream. The ECM and the TAC module are linked via a dedicated class 2 bus wire, which might explain the Reduced Power complaint and the P1518 DTC. Lets look at a ground distribution chart for the answer. DTC P1654 Cruise Control Inhibit Output Circuit P1404 Exhaust Gas Recirculation (EGR) Closed Position DTC P1627 A/D Performance P1546 A/C Clutch Status Circuit Low Voltage Refer to Using a small battery-powered Dremel tool with a miniature wire brush, I carefully buffed the paint off the block and cleaned the retaining bolt threads. As described in the July 2015 issue of Underhood Service (The 1,300-Mile Test Drive), a seemingly routine loss of power and a no-cranking, no-instrument cluster, no-scan-tool communication complaint on a 2003 GMC Yukon, VIN Z 5.3-liter flex fuel engine turned out to be a major Diagnostic Dilemma. DTC P1518 sets when there is a short to B+ on the TAC module ground circuit. Many alternator problems turn out to be nothing more than a bad connection at the alternator or a bad wiring harness. Test the TAC side of the fuse terminal for continuity to ground with a DMM. I took my vehicle in to get checked last month cause the check engine light was on. After removing G105, I found the block surface coated with heavy black paint and the threads of the retaining bolt heavily corroded. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. P1114 Engine Coolant Temperature (ECT) Sensor Circuit Turn ON the ignition, with the engine OFF, Test for a short to voltage at both throttle actuator motor control circuits with a DMM. An improperly torqued TAC module ground may be at fault. Inspect the fuses for the circuits that are in the TAC module harness--i.e. Code P1518 GMC Possible Causes Dead or weak battery Faulty Throttle Actuator Control (TAC) module Throttle Actuator Control (TAC) module harness is ope or shorted Throttle Actuator Control (TAC) module circuit poor electrical connection Check Throttle Actuator Control (TAC) module connector for water Repairing Connector Terminals DTC P1536 Engine Coolant Over temperature - Air Conditioning (A/C) Disabled DTC P1615 Loss of VTD Serial Data P1346 Intake Camshaft Position [CMP] Sensor System Performance Low Voltage Case closed? DTC P1660 Cooling Fan Control Circuits P1380 Misfire Detected - Rough Road Data Not Available The Fora platform includes forum software by XenForo. What are the common causes of code P1518? Ckt. Position PerformanceP1517 Electronic Throttle Module P1518 Electronic Throttle Module to PCM Communication We pressed on the gas pedal and it seemed like the care kept slowing down. DTC P1682 Driver 5 Line 2 Disconnect the TAC module 10-way harness connector. The OBD-II DTC codes here generally apply to all OBD-II GM vehicles from 1996 and newer: GMC, Chevrolet, P1518 PCM & TAC module communication detected missing or invalid serial data. A DTC P1518 was stored in the history codes, which my clients shop diagnosed as a bad ignition switch. DTC P1586 Cruise Control Brake Switch 2 Circuit P1540 Air Conditioning (A/C) Refrigerant Overpressure - Air The alternator and starter are grounded through G105, located at the left front of the engine. DTC P1628 ECT Pull-Up Resistor DTC P1619 Engine Oil Life Monitor Reset Circuit If TAC related repair has been done, clear DTC & recheck system. to the TAC module ground circuit. P1673 Engine Hot Lamp Control Circuit P1674 Tachometer Control Circuit P1675 EVAP Vent Solenoid Control Circuit Refer to any help would be appreciated. Also, it said that my fan was very high. Refer to, Test the throttle actuator motor control circuits for a short to ground at the TAC module 16-way harness connector with a DMM. Thanks for this post. P1141 HO2S Heater Control Circuit Bank 1 Sensor 2 DTC P1585 Cruise Control Inhibit Output Circuit DTC P1691 Coolant Gage Circuit Low Voltage I just put in a new alternator and now when I turn on the air conditioning I lose rpm's and it will shut off when I am at a stoplight or in idle. Took the TB to autozone and got code P1518 Electronic throttle module to PCM Communication. P1360 Ignition Coil Group 2 Control Circuit P1397 Wheel Speed Sensor 2 - G - Sensor Circuit Low Voltage P1281 Accelerator Pedal Position Sensor 2 Circuit Performance DTCs set will almost always contain a P1518 and may contain any of the following (P1516, P2108, P0220, P0120, U0107). DTC P1633 Ignition 0 Switch Circuit P1524 Throttle Closed Position Performance Mechanical problem with the intake manifold or linkage Failed IMRC actuator Wiring problems Faulty PCM What are the symptoms of code P1518? Recently in the past couple weeks I have noticed that when I get on the gas and any speed the truck seems to hesitate all the way through accelerating and even at steady speeds on the highway. You need to get a scanner to use to check for codes. Module programming error Aftermarket performance products Damaged PCM IMRC monitor signal circuit shorted to PWR GND or SIG RTN Damaged IMRC actuator or solenoid Blocked vacuum hoses TAC motor wire shorted together TAC motor circuit wires short to PWR Damaged electronic throttle body (ETB) Damaged PCM Open Questions: This serial data circuit is separate from any other serial data circuit on the vehicle. Fortunately for us, the Yukon went into Reduced Power mode before leaving the parking lot on its first test drive. Circuit Testing From my manual: P1518 - Electronic Throttle Module to PCM Communication This seems to indicate that there is a communication problem between the two modules. P1372 Crankshaft Position (CKP) Sensor A-B Correlation P1237 Injector Circuit Cylinder 6 Intermittent P1817 TFP Valve Position Sw. - Reverse With Drive Ratio The answer lies in Ohms Law. I am not sure what the problem is. This type of fretting may be caused by vibration, thermal cycling and/or poor connection/terminal retention. P1217 Fuel Solenoid Response Time Too Long Fuel) Gas Mass Sensor Circuit Low Frequency P1138 HO2S Bank 1 Sensor 2 Rich or High Voltage Surprisingly, after the new ECM was installed, the TAC module immediately went into the Reduced Power mode as the ignition was turned on. Does the DMM indicate continuity to ground? 6 P1164 HO2S Bank 2 Sensor 3 Rich or High Voltage Complaint: An intermittent no-crank/no-start condition along with an intermittent malfunction indicator lamp and service message(s) being displayed. Its anybodys guess. When my truck is wot some times it will shut down and says reduced engin power.I scand it and three fault codes came up .1. p1516 electronic throttle module tp 2. p1518 electronic throttle module to pcm communication 3. p2108 unknown fault. P1655 EVAP Purge Solenoid Control Circuit P1523 Throttle Closed Position Performance The vehicle blows black smoke and leaks water from exhaust. P1893 Engine Torque Signal Low Voltage P1894 Engine Torque Signal High Voltage P1895 TCM to ECM Torque Reduction Circuit. But, the connection is tight now, and everything seems to be working fine Just for future reference, how did you discover that that was the problem? The TB now loses power and (Reduced Engine Power) light comes on. P1315 Ignition Coil 4 Primary Feedback Circuit Disconnect the throttle actuator control (TAC) module connectors. P1271 Accelerator Pedal Position (APP) Sensor 1-2 Correlation P1607 Serial Communication Problem With Device 7 P1645 Evaporative Emission (EVAP) Vent Solenoid Contorl Circuit are high, B+. The Throttle Actuator Control (TAC) module contains data which is essential for proper TAC operation. P1109 Secondary Port Throttle System DTC P1559 Cruise Control Power Management Mode DTC P1502 Theft Deterrent Fuel Enable Signal Not Received. HighP1420 Intake Air Low Pressure Switch Circuit Low Voltage DTCs set will almost always contain a P1518 and may contain any of the following (P1516, P2108, P0220, P0120, U0107). Disconnect the PCM connector that contains the TAC module serial data circuits. DTCP1518 sets if the TAC module ignition feed circuit is shorted to a B+ supply circuit. On the negative side, the Yukon was now in a hard-failure Reduced Power mode, and the P1515 and P2135 codes are now repeatable DTCs. DTC P1652 Powertrain Induced Chassis Pitch Output Circuit On DTC P1501 Vehicle Speed Sensor Circuit Intermittent. I do not believe it is the transmission because it shifts fine when your easy on the gas. DTC, Description DTC P1504 Vehicle Speed Output Circuit In this case study, we had two separate complaints: a loss of power and a loss of ECM functions, including storing codes. Refer to, Test both TAC motor circuits for a short to voltage. DTC P1632 Theft Deterrent Fuel Disable Signal Received Do not replace the control module, wiring or component for intermittent problems that cannot be duplicated. P1576 BBV Sensor Ckt. DTC P1514 Airflow to TP Sensor Correlation High P1565 Cruise Servo Position Sensor P1566 Engine RPM Too High - Cruise Control Disabled DTC P1651 Fan 1 Relay Control Circuit (If I had to do that test again, I would have used a larger-amperage lamp and measured the ECMs amperage flow with the engine running at the ECMs G103 ground.) P1518 CHEVROLET - Electronic Throttle Module to PCM Communication Condition/Concern: Customers may have a concern of lack of power and engine light on. If the PCM detects a loss of data or invalid data, this DTC P1111 Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage P1571 Traction Control Torque Request Circuit DTC P1604 Loss of IPC Serial Data Are there any DTCs that have not been diagnosed? But, making more power with less displacement puts more stress on the engine. After all was secured, I coated G105 with an anti-corrosion aerosol. The Engine Control Module (ECM) has detected a loss of data or invalid data from the Throttle Actuator Control (TAC) . It may not display this or other websites correctly. The second complaint, which was a no-cranking, no-start, instrument cluster failure and a complete lack of trouble codes could be caused by the ECM simply dropping offline through a loss of power or ground. Fuel) Gas Mass Sensor Circuit High Frequency DisabledP1537 A/C Request Circuit Low Voltage P1538 A/C Request Circuit High Voltage P1539 A/C Clutch Status Circuit High Voltage DTC P1540 Air Conditioning (A/C) Refrigerant Overpressure - Air Conditioning (A/C) P1586 Cruise Control Brake Switch 2 Circuit G103 is vulnerable to engine vibration and is a pattern failure. But, the logic is simple: the ECM commands the starter relay to crank the engine and, with the exception of the voltmeter being sourced from the ignition switch, the operating information displayed on the instrument cluster is relayed to the cluster via a data bus from the ECM. Grounds G103 and G104 (and the body-to-engine ground cable) also ground feed through G105, which proved to be the critical clue in this months Diagnostic Dilemma. my truck will not keep running.what do you think is wrong.i took the pcm fuse out not knowing what would happen,my check engine light came on and across the dash it read engine power lowered so i put the fuse back the check engine light went out,but since then my truck will not stay running. PerformanceP1405 Exhaust Gas Recirculation System Valve 3 DTC P1573 PCM/EBTCM Serial Data Circuit P1450 Barometric Pressure Sensor Circuit P1159 HO2S Cross Counts Bank 2 Sensor 2 P1161 HO2S Heater Control Circuit Bank 2 Sensor 2 Problem With Device 1 Pasted as rich text. Use only a clean nylon brush that is dedicated to the repair of the conditions. NOTE: This information is presented for information purposes only. S103 terminates into a single wire that is grounded to the rear of the right-hand cylinder head at G103. DTC P1635 5 Volt Reference Circuit DTC P1503 Theft Deterrent Fuel Enable Signal Not Correct So, how could cleaning the engine block ground solve the P1515 and P2135 DTCs and the Reduced Power mode? Sens. Test both sides of the ETC/ECM fuse with a test lamp connected to ground. Upload or insert images from URL. P1132 HO2S Circuit Low Variance Bank 2 Sensor 1 P1107 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage P1391 Wheel Speed Sensor 1 - G - Sensor Circuit Performance Repairing Connector Terminals Or it could be the idle air control valve, if most of the trouble is at idle and take off. P1214 Injection Pump Timing Offset P1215 Ground Fault Detection Indicated P1216 Fuel Solenoid Response Time Too Short When the TAC module is unable to write or read data to and from random access memory (RAM), or the TAC module is unable to correctly read data from the flash memory or and internal TAC module processor fault is detected and the Detected Trouble Code (DTC) is set. Clear any DTCs from the memory that may have been set by . The control module turns OFF the malfunction indicator lamp (MIL) P1518 Electronic Throttle Module to PCM Communication I have a 1961 C-10 that I recently swapped a built 5.3/ NV3500 5 speed into. DTCs set will almost always contain a P1518 and may contain any of the following (P1516, P2108, P0220, P0120, U0107). DTC P1606 Serial Communication Problem With Device 6 The vehicle warranty is only good to 36,000. The throttle actuator control (TAC) module and the powertrain control module (PCM) communicate via a dedicated serial data circuit. DTC P1689 Delivered Torque Circuit Fault P1395 Wheel Speed Sensor 2 - G - Sensor Circuit An improperly torqued TAC module ground may be at fault. And it seems the fuel economy is a little worse. P1270 Accelerator Pedal Position Sensor A/D Converter Error All of the voltage drops were within the time-honored 500 mV range for 12-volt circuits and 50 mV for 5-volt circuits. On high current power circuits, this condition may cause permanent increases in the resistance and may cause a device to become inoperative. P1423 Intake Air High Pressure Switch Circuit High Voltage DTC P1643 Engine Speed Output Circuit fails. DTC P1560 Transaxle Not in Drive - Cruise Control Disabled For a better experience, please enable JavaScript in your browser before proceeding. High Voltage P1825 Internal Mode Switch - Invalid Range Circuit Description. P1121 Throttle Position (TP) Sensor Circuit Intermittent High P1320 IC 4X Reference Circuit Intermittent P1228 Injector Circuit Cylinder 3 Intermittent Ckt. Of course, the accessibility of grounds G103 and G104 is made difficult by a fiber/metallic heat shield wedged between the engine and body. P1689 - No Communication Between ECM and Injection Pump Module; P1690 - Fuel injection pump crankshaft position sensor Does Not Agree With ECM crankshaft position Sensor; var prefix = 'mailto'; An improperly torqued TAC module ground may be at fault. You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs! First, it is a good thing that the check engine light came on. Still goes reduced engine power under load, climbing a steep hill etc. There is a small hose that sits under the Votec Box. DTC P1669 ABS Unit Expected DTC P1637 Generator L-Terminal Circuit Is this causing my car to shake, lose power because I was only go no more than thirty miles per hour? DTC P1535 A/C High Side Temperature Sensor Circuit Systems. P1106 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage 1) Never trust a voltage drop reading on a circuit that grounds more than one actuator or module because the voltage drop depends very much on peak amperage. to Amazon, eBay and other sites may include affiliate code. DTC P1501 Theft Deterrent System Hydraulic lifters are precision-fit assemblies. of serial data requires not only good circuit integrity but also adequate system voltage. P1502 Theft Deterrent Fuel Enable Signal Not Received DTC P1520 Transmission Range Switch Circuit DTC P1614 Loss of RIM Serial Data The TAC module continuously test the integrity of this data. P1421 Intake Air Low Pressure Switch Circuit High Voltage Inspect the fuses for the circuits that are in the TAC module harness--i.e. If so clean the throttle body bore and the throttle valve plate using a toothbrush and approved throttle body cleaner then retry. Mistakes made can result in costly comebacks. P1660 Cooling Fan Control Circuits P1661 MIL Control Circuit P1662 Cruise Lamp Control Circuit P1663 Oil Life Lamp Control Circuit P1664 1-4 Upshift Lamp Control Circuit P1665 Driver 3 Line 5P1666 Driver 3 Line 6P1667 Reverse Inhibit Solenoid Control Circuit Condition/Concern: Customers may have a concern of lack of power and engine light on. An inspection of the fuses may lead you to the circuit that is shorted to the TAC module ground circuit. Increasing the engine speed to 3,000RPM aids in locating a shorted throttle actuator motor control circuit. P1119 ECT Signal Out-Of-Range With TFT Sensor DTC P1521 Transmission Engaged at High Throttle Angle P1409 EGR Vacuum System Leak P1410 Fuel Tank Pressure System P1415 Secondary Air Injection (AIR) System Bank 1 DTC P1620 Low Coolant Circuit P1287 Accelerator Pedal Position Sensor 3 Circuit Low Voltage DTC P1539 A/C Clutch Status Circuit High Voltage P1353 IC Output High/Pulse Detected when GND_Cyl. or is the DIC showing "Reduced Engine Power? P1533 A/C Evaporator Temp. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. sets. ModuleP1390 Wheel Speed Sensor 1 - G - Sensor Circuit DTC P1672 Low Engine Oil Level Lamp Control Circuit The block ground, G105, is similarly difficult to access since it disappears under the engine and is boxed into a hole formed by the engine mount, timing cover and front differential. DTC P1532 A/C Evaporator Temp. DTC P1681 Driver 5 Line 1 DTC P1545 Air Conditioning (A/C) Clutch Relay Control Circuit P1392 Wheel Speed Sensor 1 - G - Sensor Circuit Low Voltage Cannot seem to find a common connection as to when or why I can it expect it. There are other codes that would show up if the ECM or throttle module themselves were bad. If you click them and The ignition voltage is more than 5.23volts. P1144 HO2S Bank 1 Sensor 3 Rich or High Voltage P1584 Cruise Control Disabled P1585 Cruise Control Inhibit Output Circuit DTC P1508 Idle Speed Low - Idle Air Control (IAC) System Not Responding DTC P1518 Throttle Actuator Control (TAC) Module Serial Data Circuit. This could be a dirty connector or a frayed wire. Sounds like a tps, or tps wiring problem. P1273 "Accelerator Pedal Position Sensor 1 It sounds like a bad fan clutch on the engine. Paste as plain text instead, (Merged). P1335 CKP Circuit DTC P1579 P/N to D/R at High Throttle Angle - Power Reduction Mode Active DTC P1653 Oil Level Lamp Control Circuit DTC P1640 Driver-1-Input High Voltage Test for a short to voltage on both serial data circuits at the TAC module 16-way connector with a DMM. A forum community dedicated to all General Motors truck owners and enthusiasts. The throttle actuator control (TAC) module and the powertrain control module (PCM) communicate via a dedicated serial data circuit. P1363 IC Cylinder 3 Not Toggling After Enable in Wiring Systems. DTCs set will almost always contain a P1518 and may contain any of the following (P1516, P2108, P0220, P0120, U0107). RespondingP1509 Idle Speed High - Idle Air Control (IAC) System Not No other codes are associated. What happens after it runds good? P1835 Kick-Down Switch Circuit P1836 Kick-Down Switch Failed Open P1837 Kick-Down Switch Failed Short P1842 1-2 Shift Solenoid Circuit Low Voltage So After Cleaning The Throttle Body Electrical Problem P1518 Citroen Description. DTCs set will almost always contain a P1518 and may contain any of the following (P1516, P2108, P0220, P0120, U0107). DTC P1516 Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance Immediately after delivery, I discovered a clean diagnostic memory in all modules, which was especially odd since 40 engine warm-up cycles are required to erase the ever-present P1518. This happened quite awhile ago but stopped now it seems to do it every day. "Reduced Power" or "Limp Mode" which is designed to get the car where it is My Mother's Suv Is A 1500 Z71. An inspection of the fuses may lead you to the circuit that is shorted DTCP1518 sets because no communication is detected by the TAC module from the PCM. (Replacing the ECM is also included in step 27 of the 29-step diagnostic process required to correct a P1518 trouble code.) P1519 Citroen Electronic . Servicing GM Autoride Rear Air Suspension. While G105 appears fully functional, its a bad ground with a loose retainer bolt that is highly susceptible to electrical load. P1572 ASR Active Circuit Low Too Long P1573 PCM/EBTCM Serial Data Circuit P1574 Stoplamp Switch Circuit P1575 Extended Travel Brake Switch Circuit DTC P1630 Theft Deterrent Learn Mode Active But, since the data stream anomalies continued to bother me, we used a back-up lamp drawing 2.5 amps of current to load the circuits. I took it to the dealer and they said they have never seen this and they will have to call up GM. I should have looked in pcm tunnig .thanks, I need a dual battery kit or some thing. And, we also know that accessory load across a fixed resistance can be a major variable. Test both serial data circuits at the TAC module 16-way connector for a short to ground with a DMM.
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